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        <h2>
          <span class="refentrytitle">GEN43</span>
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        <p>GEN43 — 
      Loads a PVOCEX file containing a PV analysis.
    </p>
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      <div class="refsect1">
        <a id="idp215803344"></a>
        <h2>Description</h2>
        <p>
This subroutine loads a PVOCEX file containing the PV analysis (amp-freq)
of a soundfile and calculates the average magnitudes of all analysis frames
of one or all audio channels. It then creates a table with these magnitudes
for each PV bin.
    </p>
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        <h2>Syntax</h2>
        <pre class="synopsis"><span class="command"><strong>f</strong></span> # time size 43 filecod channel</pre>
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      <div class="refsect1">
        <a id="idp215868688"></a>
        <h2>Initialisation</h2>
        <p>
    <span class="emphasis"><em>size</em></span> -- number of points in the table,
    power-of-two or power-of-two plus 1.  
      GEN 43 does not make any distinction between these two sizes, but it
      requires the table to be at least the fftsize/2. PV bins cover the
      positive spectrum from 0Hz (table index 0) to the Nyquist (table index
      fftsize/2+1) in equal-size frequency increments (of size sr/fftsize).
    </p>
        <p>
      <span class="emphasis"><em>filcod</em></span> -- a pvocex file (which can be generated
       by pvanal).
    </p>
        <p>
      <span class="emphasis"><em>channel</em></span> -- audio channel number from which
      the magnitudes will be extracted; a 0 will average the
      magnitudes from all channels. 
    </p>
        <p>
     Reading stops at the end of the file.
    </p>
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              <th align="left">Note</th>
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                <p>if p4 is positive, the table will be post-normalised.  A
      negative p4 will cause post-normalisation to be skipped. 
      </p>
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        <a id="idp215874272"></a>
        <h2>Examples</h2>
        <p>
       </p>
        <pre class="programlisting"><span class="stamnt">f</span>1 0 512   43  "viola.pvx" 1
<span class="stamnt">f</span>1 0 -1024 -43 "noiseprint.pvx" 0</pre>
        <p>
</p>
        <p>
This table can be used as a masking table for pvstencil and pvsmaska. The
first example uses a 1024-point FFT phase vocoder analysis file from which
the first channel is used. The second uses all channels of a 2048-point
file, without post-normalisation. For noise reduction applications with
pvstencil, it is easiest to skip table normalisation (negative GEN code).
    </p>
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      <div class="refsect1">
        <a id="idp215878160"></a>
        <h2>Credits</h2>
        <p>Author: Victor Lazzarini</p>
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